A Night at the Opera is a 1975 album by British rock band Queen. It was produced by Roy Thomas Baker and Queen, and reportedly was, at the time of its release, the most expensive album ever made. It was originally released by EMI in the UK where it topped the charts for nine weeks, and Elektra Records in the United States where the album peaked at #4 and has been certified Triple Platinum (three million copies sold).

The album takes its name from the Marx Brothers film of the same name, which the band watched one night at the studio complex when recording. The 1976 follow-up album, A Day at the Races, was also named after a Marx brothers film.